There are several things to check if your Calendar or Task reminders do not appear.

First, make sure that the reminders are enabled. To do this:

  • In Outlook 2007, go to Tools > Options > Other > Advanced Options > Reminder Options. Make sure the Display the Reminder option is selected.
  • In Outlook 2010/2013, go to File > Options > Advanced and find the Reminders section. Make sure the Show Reminders option is selected.
    options

If this field was already checked, then please make a backup of your data and proceed with the steps below. Read the Knowledge Base article on How to export data in Outlook for details on backing up your data.

  1. Once you have your data backed up, close Outlook. Then click Start > Run, and type in:
    outlook.exe /cleanreminders
    and press Enter or click OK.
    All of the reminders that you have missed should start to appear on your screen. If they do not, create a test task or calendar appointment to see if you are prompted with a reminder. If you do not get prompted with a reminder, continue on to step 2.
    cleanreminders
  2. Close Outlook. Then click Start > Run, and type in:
    outlook.exe /cleanfreebusy
    and press Enter or click OK.
    All of the reminders that you have missed should start to appear on your screen. If they do not, create a test task or calendar appointment to see if you are prompted with a reminder. If you do not get prompted with a reminder, continue on to step 3.
  3. Close Outlook, then click Start > Run, and type in:
    outlook.exe /resetfolders
    and press Enter or click OK.
    All of the reminders that you have missed should start to appear on your screen now.